http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
SM45C강의 고온피로에 미치는 Notch효과에 관한 실험적 연구
崔壯宇,金楠鎬 弘益大學校 1987 弘大論叢 Vol.19 No.2
This paper the Rotating bending fatigue tests were performed on the SM45C carbon steel, and the effect of the test temperature on the fatigue strength, the notch factor and the shape of fatigue fracture surface were studied. The following results are obtained: 1. In case of test temperature 300°C, the fatigue strength of smooth specimen, U-notched specimen, V-notched specimen were denoted by 10^(7) Cycle increased 16.5%, 14.7%, 10.1% as compared with fatigue strength of room temperature. 2. A difference of the fatigue strength of smooth specimen was great in each temperature of the room temperature and 300°C, 450°C, but that was decreased of notched specimen as increased of the revolution cycles. 3. According as stress concentration factor being increased, the notch factor was increased. It was a greater notch factor than the stress concentration factor, when the range of N>1 x 10^(6) at 300°C_in U-notched specimen, and when the range of N>6 x 10^(6) at 450°C in U-notched specimen. 4. Variation of notch factor by the revolution cycles, according as the revolution cycles being increased, the notch factor was increased when the room temperature, 300°C, but notch factor takes constant value at 450°C. In case of stress concentration factor 1.87, notch factor was almost equal to the stress concentration factor. 5. When the approximate equation of Peterson and Neuber by notch factor applied an experimental results, approximate equation of Peterson approached an experimental results as inside of 25% error. 6. The fracture surface in notched specimen had the difference of the location and the area of brittle fracture surface in compliance with height of stress level.
한국기업의 웹기반 글로벌 선적서류통합관리시스템 구축에 관한 연구
최장우,김만길,정한구 한국무역연구원 2010 무역연구 Vol.6 No.2
Korea became a well-known leader in the paperless trade infrastructure and strategic policies. An one-stop trading system named 'u-Trade Hub' is operated by a paperless trade service provider KTNET. It includes foreign exchange transactions, improving trading procedures and reducing related expenses for a savings of 2.5 trillion won per year. Moreover, the efforts were expanded to the global areas. Korea has started its efforts to activate multi-national paperless trade alliances such as PAA, ASEAL as well as established the bilateral cooperative networks with China and Taiwan. This L firm's case shows that e-trade needs awareness and strong support from top management for its global business reengineering and competitive-edge, internal and external system integration, and legal validation of electronic messages and their negotiability.
치과용 연석고가 골조직재생에 미치는 영향에 관한 실험적 연구
최장우,Choi, Jang-Woo 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.3
Calcium sulfate(plaster of Paris) has been used in dental and orthopedic surgery for about 100 years. It is well known that the plaster is bioresorbable, biocompatible, defect conformable and moldable. The purpose of this study is to evaluate two effects of calcium sulfate on bone regeneration, that is, the effects of graft materials and barrier for bone regeneration. Cortical bone defects were formed for recipient site on the femurs of 19 Sprague-Dawley rats. The autogenous particulated bone and calcium sulfate were grafted to the defects. Calcium sulfate paste, $Gore-Tex^R$ membrane(W.L. GORE & ASSOCIATES LTD., U.S.A.) and rubber sheet were used for the shielding materials. The results were as follows : 1. Calcium sulfate that had been grafted in the cortical bone defect was almost resorbed before bone remodeling, resultantly had little effect on bone regeneration. 2. Resoption process of calcium sulfate grafted on the bone grafting area tends to be accelerated, as being divided into numerous small particles progressively. Under the situation where the calcium sulfate was protected, with the coverage of fascia, $Gore-Tex^R$ membrane or rubber sheet, new bone formation was confirmed with presence of calcium sulfate particles over 6 weeks after grafting. 3. In the case of calcium sulfate covered with membrane, distinct bone formation was observed on the marrow space of femur adjacent to the plaster mass. 4. Rubber shielded plaster group revealed new bone trabeculae under the rubber sheet, but it showed ischemic degeneration of superficial cortical bone.
전자상거래물품에 대한 특별통관제도 개선방안에 관한 연구
최장우 한국관세학회 2009 관세학회지 Vol.10 No.1
In accordance with a continuous increase of import of the goods transacted in the overseas internet shopping mall, the Korean government has introduced a special customs clearance management system in January 2005(revised in January 2008)to effectively respond a possible illegal clearance of the global B2C e-commerce goods and to domestically promote e-commerce. But, there are still some problems and limitations to settle this system down to protect a possible illegal import of e-commerce goods through the overseas internet shopping mall. Therefore, this study aimed to suggest some political implications and guidelines for the improvements of the system for protecting a possible illegal transactions and for establishing a basis of advanced customs administration through the exploratory research on the current system which has been applied to the global B2C e-commerce goods in Korea.